The lens SW05 J143454.4+522850: a fossil group at redshift 0.6?

Bibcode
2021MNRAS.506.1715D
DOI
10.1093/mnras/stab1825
Denzel, Philipp; Çatmabacak, Onur; Coles, Jonathan; Cornen, Claude; Feldmann, Robert; Ferreras, Ignacio; Gwyn Palmer, Xanthe; Küng, Rafael; Leier, Dominik; Saha, Prasenjit; Verma, Aprajita
Referencia bibliográfica

Monthly Notices of the Royal Astronomical Society

Fecha de publicación:
9
2021
Revista
Monthly Notices of the Royal Astronomical Society
Número de autores
11
Número de autores del IAC
1
Número de citas
0
Número de citas referidas
0
Descripción
Fossil groups are considered the end product of natural galaxy group evolution in which group members sink towards the centre of the gravitational potential due to dynamical friction, merging into a single, massive, and X-ray bright elliptical. Since gravitational lensing depends on the mass of a foreground object, its mass concentration, and distance to the observer, we can expect lensing effects of such fossil groups to be particularly strong. This paper explores the exceptional system J143454.4+522850 (with a lens redshift zL = 0.625). We combine gravitational lensing with stellar population synthesis to separate the total mass of the lens into stars and dark matter. The enclosed mass profiles are contrasted with state-of-the-art galaxy formation simulations, to conclude that SW05 is likely a fossil group with a high stellar to dark matter mass fraction (0.027 ± 0.003) with respect to expectations from abundance matching (0.012 ± 0.004), indicative of a more efficient conversion of gas into stars in fossil groups.
Proyectos relacionados
Miembros del grupo
Huellas de la Formación de las Galaxias: Poblaciones estelares, Dinámica y Morfología

Bienvenida a la página web del g rupo de investigación Traces of Galaxy Formation. Somos un grupo de investigación amplio, diverso y muy activo cuyo objetivo principal es entender la formación de galaxias en el Universo de una manera lo más completa posible. Con el estudio detellado de las poblaciones estelares como bandera, estamos constantemente

Ignacio
Martín Navarro
En ejecución
Tipo
Con árbitro
Lente gravitacional
Galaxias
Materia oscura

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